According to Margusity, a player has to have seven symptom-free days before being allowed to practice again. Researchers, who studied athletes from 100 high schools around the United States from 2005-2007, found that while male and female athletes returned to play at varying times after suffering a concussion, girls were found to return to play more quickly. Sex Differences in Concussion Symptoms of High School Students published in the Jan. 2011 edition of the Journal of Athletic Training, reported 64 percent of the student-athletes returned to play, on average, nine days post-injury. <br>For the original version including any supplementary images or video, visit http://www.timesherald.com/general-news/20131021/concussions-in-girls-schools-dealing-with-reaction-to-head-injury